Slim Jim, continually maintaining his svelte body, lifts a $70$kg barbell $1\mathrm{.}4$m above the ground.A$.$ How much energy did the barbell have when it was on the ground at rest?B$.$ What kind of energy does the barbell have in its current position?C$.$ Where did the energy come from?D$.$ Calculate the energy it has at its current position.E$.$ How much work did Jim do to lift the object?F$.$ If he lifted it in $1\mathrm{.}5$ seconds, how much power did he use?